<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="index.css">
</head>
<body>

<div class="lattice">
    <div class="layer">
        <div class="sub-box">

        </div>
        <div class="sub-box">

        </div>
        <div class="sub-box">

        </div>
    </div>
    <div class="layer">
        <div class="sub-box">

        </div>
        <div class="sub-box">

        </div>
        <div class="sub-box">

        </div>
    </div>
    <div class="layer">
        <div class="sub-box">

        </div>
        <div class="sub-box">

        </div>
        <div class="sub-box">

        </div>
    </div>
</div>

</body>
</html>